Carpenter&#39;s jack.



PATENTED MAY 29, 1906.

I. E. WYER. CARPENTERS JACK.

APPLIOATION'IILED 0012a, 1905.

No. 822,098.- PATENTED MAY 29, 1906. I. B. WYER.

OARPENTERS JACK.

APPLICATION FILED OOT.26,1805.

2 SHBETS-SHEBT 2.

UNITED STATES PATE T OFFICE.-

- 5 an 11 writs, or roRTsMoUTH, oiiio; 1

- CARPENTERS JACK.

Specification of Letters Patent.

Patented May 29, 1906.

Application filed October 26, 1905. Serial No. 284.572.

have invented new and useful Improvements in Carpenters Jacks, ofv whichthe following is a specification.

- Thisinvention relates to certain new and useful improvements in adevice for use by carpenters in forcing matched boards into position,asinlaying flooring or in other similar applications.

The invention has for its objects to provide a device of this characterwhich may be used with ease and facility, Which shall possess strengthand reliability in operation and which shall be simple in constructionand economical to manufacture.

. Detailed objects of the invention, whereby the above-stated advantagesare obtained, will be more clearly understood from the detaileddescription to follow.

In order that the invention may be clearly understood, I haveillustrated the same in the accompanying drawings, in which Figure 1 isa perspective view of the device, showing the same in position for use.Fig. 2 is a broken transverse sectional view, and Fig. 3 is a bottomplan view.

Referring now to the drawings, 1 indicates the operating lever orhandle, which is bifurcated at its lower end, as indicated by 2, and ispivotally mounted at such lower end by means of a pivot-pin 3 betweenstandards 4, extending from a block or base 5. Pivotally mounted in thebifurcated portion of the handle are two dogs 6 and 7, respectively, the

dog 6 being mounted at its iniier end on a pivotpin 8 and the dog 7intermediate its ends on the pin 3, on which the handle is mounted. Inoperation the dog 6 is held to its work by means of a leaf-spring 9,mounted at one end on the handle 1 and having its free end slidablyengaging the outer edge of the dog 6, while the dog 7 is held to itswork by means of a coiled spring 10, secured at one end to the handleand at its other end to the rearwardly-projecting end of the dog 7. Thebase 5 is provided on one side with a guideway or groove 11, the bottomof which is inclined, as indicated at 12, said groove serving, inconnection with a cross-bar 13, connecting the standards 4, as a housingand guide for a rack-bar 14, the teeth of which are engaged by the dogs6 and 7. Said rack-bar is provided on its outer end with a semicircularhead 15, provided with a central recessed portion 16, the outer straightedge of said head being grooved longitudinally, as indicated. at 17, toreceive the tongue 18 of a board. The recess 16 is for the purpose ofpermitting the head 15 to engage a board on opposite sides of a sleeper,as 19, as will be clearly understood. On the side of the base 5 oppositeto that having the standards 4 there project claws 20, located atopposite edges ofsaid base, each of which claws is provided with arecess 21, in which is eccentrically and pivotally mounted a corrugatedgripping member or cam 22, the space between said gripping-cams beingsufficient for the reception edgewise of a sleeper of the ordinarywidthused in floor construction. The gripping-cams 22 are connected to orformed integral at their upper ends with two intermeshing segment-gears23, which work in circular recesses 24, formed in the outer face of thebase 5, leaving projecting portions 26 of the base to rest upon thesleeper, and thus hold the segment-gears out of contact therewith. Thepurpose of the segment-gears is to insure the simultaneous and uniformmovement of the gripping-cams, and the pivot com: mon to eachcam andgear is indicated at 27.

The rack-bar 14 may be provided at its rear end with a screw 28, thehead of which is left projecting to prevent said rack-bar from fallingout of the base.

The operation of the device is as follows: A board 29 being placed inposition on the sleepers 19 to have its groove engage the tongue of apreviously-laid board, my device is brought into position, so that thehead 15 will engage the outer edge of said board, as indicated in thedrawings. In this position the parts 26 of the base will rest upon thetop of a sleeper, while the grippingcams 22 will be on opposite sides ofthe latter and in frictional contact therewith. The handle is now movedin a direction toward the board 29. This movement will carry the dog 6in a similar direction, and as said dog has its outer end held inengagement with the teeth of the rack-bar 14 the latter will also bemoved forward or toward the board 29. As the base 5 serves as thefulcrum for the handle 1, the above operation moved forward the springwill beentended, exerting a yielding force on the dog 7 to hold its freeend in engagement with the rack-bar 14, while permitting the forwardmovement ofi'th'e latter. In the backward movement of the handle the dog6 will be drawn over one or more teeth of the rack-bar, while the dog 7,having the same pivot as the handle, will not be moved and will operateto hold the rack-bar in the osition to which it has been forced by the0g 6, the handle never being moved backward a suflicient distance topermit the spring 10 to entirely retract, and thus cease to exert apull-on the rear end of the dog 7. In practice the handle is rapidlymoved back and forth through a small arc a few times and the board 29will be quickly forced into position. The handle may then be releasedand the board will be held in position while the nails are being driven.By. forming the bottom of the guide-groove for the rack-bar inclinedsaid rack-bar in operation will force the outer edge of the board 29downward into contact with the sleeper, as will be clearly apparent froman inspection of Fig. 2.

For the sake of brevity I will refer to the dog 6 in the claims asforcing-dog and the dog 7 as a holding-dog.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, isv 1. A carpenters jack comprisinga base, a rack-bar slidably mounted therein in an inclined position, aforcing and a holding dog cooperating with said rack-bar, and means foroperating said dogs.

2. A carpenters jack comprising a base, a rack-bar slidably mountedtherein, an operating-lever, a forcing-dogdpivotally mounted on saidlever, a holdingo a pivot-pin in said base common to said Iioldingwlogand lever, and springs carried by said lever for controlling the actionof said dogs.

3. A carpenters jack com rising a base, a rack-bar slidably mountetherein in an inclined position, an operating-lever pivotally mounted insaid base, a forcing-dog pivotally mounted on said lever, a holdin -dogpivotally mounted intermediate its en s on the pivot of said lever, andsprings operating .to hold said dogs normally in engagement with theteeth of said rack-bar.

4. In a carpenters jack, in combination with the base, a pair ofintermeshing gears rotatably mounted on the base, and a gripping membercarried by each gear.

5. In a carpenters jack, in combination with the base, a pair ofintermeshing gears rotatably mounted on the base, and a pair ofeccentr-ically-mounted gripping members carried, respectively, by saidgears.

6. In a carpenters jack, in combination with the base, a pair ofintermeshing gears rotatably mounted on the base, and a pair ofecoentrically-mounted, corrugated, gripping members carried,respectively, by said gears.

7. In a carpenters jack, in combination with a base provided withrecesses; a pair of intermeshing gears rotatably mounted in saidrecesses, and a gripping-cam carried by each gear.

In testimony whereof I have hereunto set my hand in presence of twosubscribing Wit- Ilesses.

IRA E. WYER.

Witnesses:

LOUISE MILLAR, EDGAR G. MILLAR.

